Skip to content

Tidy t-test statistic

Source: R/wrappers.R
t_stat.Rd

A shortcut wrapper function to get the observed test statistic for a t test. This function has been deprecated in favor of the more general observe().

Usage

t_stat(
  x,
  formula,
  response = NULL,
  explanatory = NULL,
  order = NULL,
  alternative = "two-sided",
  mu = 0,
  conf_int = FALSE,
  conf_level = 0.95,
  ...
)

Arguments

x

A data frame that can be coerced into a tibble.

formula

A formula with the response variable on the left and the explanatory on the right. Alternatively, a response and explanatory argument can be supplied.

response

The variable name in x that will serve as the response. This is an alternative to using the formula argument.

explanatory

The variable name in x that will serve as the explanatory variable. This is an alternative to using the formula argument.

order

A string vector of specifying the order in which the levels of the explanatory variable should be ordered for subtraction, where order = c("first", "second") means ("first" - "second").

alternative

Character string giving the direction of the alternative hypothesis. Options are "two-sided" (default), "greater", or "less".

mu

A numeric value giving the hypothesized null mean value for a one sample test and the hypothesized difference for a two sample test.

conf_int

A logical value for whether to include the confidence interval or not. TRUE by default.

conf_level

A numeric value between 0 and 1. Default value is 0.95.

...

Pass in arguments to infer functions.

See also

Other wrapper functions: chisq_stat(), chisq_test(), observe(), prop_test(), t_test()

Other functions for calculating observed statistics: chisq_stat(), observe()

Examples

library(tidyr)

# t test statistic for true mean number of hours worked
# per week of 40
gss %>%
   t_stat(response = hours, mu = 40)
#> Warning: `t_stat()` was deprecated in infer 1.0.0.
#> ℹ Please use `observe()` instead.
#>        t 
#> 2.085191 

# t test statistic for number of hours worked per week
# by college degree status
gss %>%
   tidyr::drop_na(college) %>%
   t_stat(formula = hours ~ college,
      order = c("degree", "no degree"),
      alternative = "two-sided")
#>       t 
#> 1.11931